<div class="row text-center">
    <div class="col-md-1">
        {{ngModel.num}}
    </div>
    <div class="col-md-5">
        <button class="btn btn-default mybtn" id="mybtn{{ngModel.num}}">点我</button>
        <button class="btn btn-primary" ng-click="callback()">点我回调</button>
    </div>
    <div class="col-md-6">
        <b>{{ngModel.title}}</b>
    </div>
</div>